package chapter5;

/**
 * 将字符串转大小写
 */
public class Test5_9_1 {
    public static void main(String[] args) {
        String str = "abcdfre";
        System.out.println("转大写：" + str.toUpperCase());
        System.out.println("转小写：" + str.toLowerCase());
    }
}
